I HAD UNPROTECTED SEX ABOUT 3WEEKS AGO...ABOUT 4 DAYS AGO I GOT OUT OF THE SHOWER AND USUALLY PUT JOHNSONS BABY LOTION ON MY PENIS AND TESTICLES, BUT I HAD RAN OUT SO I USED MY GIRLFRIENDS NIVEA LOTION INSTEAD....THE NEXT DAY MY TESTICLES WERE REALLY RED AND VERY ITCHY...I HAVE NO BUMPS ON MY TESTICLES, I JUST WANTED TO KNOW IF RED, ITCHY TESTICLES COULD BE A SIGN OF A STD?